From d3f59f6de40f2cb50c50d6add744eabd63e999f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <pawel.bylica@imapp.pl>
Date: Thu, 9 Oct 2014 11:37:19 +0200
Subject: [PATCH] Introducing GasMeter

---
 evmcc/Compiler.cpp |  4 +++-
 evmcc/GasMeter.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 evmcc/GasMeter.h   |  9 +++++++++
 3 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 evmcc/GasMeter.cpp
 create mode 100644 evmcc/GasMeter.h

diff --git a/evmcc/Compiler.cpp b/evmcc/Compiler.cpp
index 880487705..91bc692eb 100644
--- a/evmcc/Compiler.cpp
+++ b/evmcc/Compiler.cpp
@@ -12,6 +12,9 @@
 namespace evmcc
 {
 
+using dev::eth::Instruction;
+using namespace dev::eth; // We should move all the JIT code into dev::eth namespace
+
 struct
 {
 	llvm::Type* word8;
@@ -191,7 +194,6 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 
 		for (auto currentPC = basicBlock.begin(); currentPC != basicBlock.end(); ++currentPC)
 		{
-			using dev::eth::Instruction;
 			auto inst = static_cast<Instruction>(bytecode[currentPC]);
 			switch (inst)
 			{
diff --git a/evmcc/GasMeter.cpp b/evmcc/GasMeter.cpp
new file mode 100644
index 000000000..3687cfed3
--- /dev/null
+++ b/evmcc/GasMeter.cpp
@@ -0,0 +1,49 @@
+
+#include "GasMeter.h"
+
+#include <libevmface/Instruction.h>
+#include <libevm/FeeStructure.h>
+
+namespace evmcc
+{
+
+using namespace dev::eth; // We should move all the JIT code into dev::eth namespace
+
+namespace
+{
+
+uint64_t getStepCost(dev::eth::Instruction inst) // TODO: Add this function to FeeSructure
+{
+	switch (inst)
+	{
+	case Instruction::STOP:
+	case Instruction::SUICIDE:
+		return 0;
+
+	case Instruction::SSTORE:
+		return static_cast<uint64_t>(c_sstoreGas);
+
+	case Instruction::SLOAD:
+		return static_cast<uint64_t>(c_sloadGas);
+
+	case Instruction::SHA3:
+		return static_cast<uint64_t>(c_sha3Gas);
+
+	case Instruction::BALANCE:
+		return static_cast<uint64_t>(c_sha3Gas);
+
+	case Instruction::CALL:
+	case Instruction::CALLCODE:
+		return static_cast<uint64_t>(c_callGas);
+
+	case Instruction::CREATE:
+		return static_cast<uint64_t>(c_createGas);
+
+	default: // Assumes instruction code is valid
+		return static_cast<uint64_t>(c_stepGas);;
+	}
+}
+
+}
+
+}
\ No newline at end of file
diff --git a/evmcc/GasMeter.h b/evmcc/GasMeter.h
new file mode 100644
index 000000000..c234a4ab6
--- /dev/null
+++ b/evmcc/GasMeter.h
@@ -0,0 +1,9 @@
+
+#pragma once
+
+#include <libevmface/Instruction.h>
+
+namespace evmcc
+{
+
+}
\ No newline at end of file